Lean Engineer, Formal Mathematics – Lean 4, Mathlib, Theorem Proving

🔥 17 hours ago

🇺🇸 United States – Remote

💵 $90 - $110 / hour

⏱ Part Time

🟡 Mid-level

🟠 Senior

👷🏻‍♀️ Engineer

👻 Ghost score 10%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Mercor

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2023

🔥 Funding within the last year

💰 $350M Series C - Mercor on 2025-10

Mercor is a company for which no descriptive text was provided in the input. Additional information (products, services, target customers, or industry specifics) is needed to create an accurate summary and select appropriate industries.

📋 Description

• Write correct, idiomatic Lean 4 statements and proofs compiling against current mathlib • Formalize natural-language mathematics across algebra, analysis, number theory, combinatorics, and logic • Review AI-generated Lean statements and proofs, identify failures or incorrect conclusions, and provide specific written feedback • Help define guidelines and rubrics for proof quality, statement fidelity, and mathlib conventions • Collaborate with Lean engineers and lab researchers to maintain consistent standards and improve quality

🎯 Requirements

• Hands-on experience writing formal proofs in Lean 4 • Comfort with mathlib and Lean 4 tactics, including finding and using appropriate lemmas • Strong background in proof-based mathematics, theoretical computer science, or logic through a degree or research record • Ability to turn written statements and proofs into correct formal statements and checking proofs • Availability for at least 20 hours per week during weekdays • Clear written communication and ability to explain proof strategy and formalization choices precisely • Nice to have: experience with Coq/Rocq, Isabelle, Agda, Haskell, Lean metaprogramming, or AI-for-math work • H1-B or STEM OPT candidates are not supported

🏖️ Benefits

• W-2 employment with payroll, benefits, and compliance through Cincinnatus LLC or appropriate international entity • Fully remote work • Flexible schedule / work on your own schedule • Payments weekly on Stripe or Wise based on services rendered • Opportunity to collaborate with leading researchers • Referral payments of up to $1,760 per successful referral (referral limits apply)